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Schrade Vac leak? Not MY mill...
Elite Guru
eastern NC / e-i-e-i-o
1909 Posts
Member since:
2008/8/15 2:01



Offline
Think your tune is perfect? And the obvious tune problems CAN'T hit you? That's what I thought too...

I've been starting mine with a weak battery since Spring. If I don't drive it for 2 weeks, battery is dead (even had a new one on the shelf for 7 weeks now). Daily starting was fine.

Saturday, I tried to crank it after an idle week. It struggled, and backfired up the intake (FOREfire?). Fire, AND detonation pressure, in the intake.

Big deal - right?

Vac hoses get old. You'd think that vacuum should seal small age-cracks - sort of. At worst, collapse them. But NEW vac hoses and caps?

What about detonation in the intake? I heard a pop, like a rubber band snapping. Then, I JUST HAPPENED TO SEE OIL SMOKE SEEPING FROM THE SNORKEL, AND FROM A NEWLY CAPPED VACUUM PORT ('90 LT5 was built w/o valve stem seals, and an idle week will show this in start-up exhaust)

The detonation popped the end right off the vac port cap. If I hadn't had the hood up, I would NEVER have noticed that... Been thinkin' on that for a week.

New build? Full of new parts, and hoses? And you missed the distributor by 180'? Oops! "I got the distributor right, WTH is wrong NOW??? "

Check those hoses; old, OR new...

Posted on: 2014/10/23 14:35
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LT5, Marc Haibeck ECM module, AUTOMATIC!!!

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bogus Re: Vac leak? Not MY mill...
Grand Imperial Pooh-Bah
San Pedro, CA
20856 Posts
Member since:
2005/9/7 0:00



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new isn't better... I have been shocked about the QC of some of this new crap.
Posted on: 2014/10/23 15:52
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw

Education is the best tool to overcome irrational fear. - me

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Matatk Re: Vac leak? Not MY mill...
Webmaster
SW Chicago Burbs
22792 Posts
Member since:
2008/1/7 0:00



Offline
Good tip!
Posted on: 2014/10/23 16:24
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc.
1989 Corvette...RIP
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